diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,2 +1,5 @@
 pypto2gpano
 ===========
+
+This is a simple python script, inspired by [a perl one](https://panotools.svn.sourceforge.net/svnroot/panotools/trunk/Panotools-Script/bin/pto2gpano)
+